Lenovo gives enough functions for that price. I had this phone 2 years ago and it was overall good phone. I didn't suffer much by using it.
But the thing is as the generation moving ahead the old things ( technology) becomes old and the new things ( technology) comes out. The phone provides good functions according to past. But in today's world I don't think you should buy it from any other store.
Because you can buy bezel less phones in the same price with great functions.
Well if we see k4 note's features then it provides 5.5"inch full hd screen which is a good screen according to me because the refresh rate is good. You can barely see any lags in the videos. Also the screen has chroning gorilla 3 protection which is good according to previous time.
It has a single back camera which is 13 mega pixels and it is a good camera though. The Front camera is 5 a mega pixel shooter which can take good selfies.
The battery is good but not the best cause the backup is too short comparing to other phones. It has a quick charger which can charge your phone in around 2 hours.
The touch was sometimes very glitchy. I always had to restart my phone.
Dual front speakers with dolby atmos which provides good surround sound.
You can not play heavy games in it as it has mediatek6753 octa-core 1.3 Ghz processor which is very old and poor. And a GPU Mali-T720MP3.
It has a 16gb of internal space and 3 gb of RAM which very very less according to the needs of today's world. And a space for a sd card upto 256gb.
It has a Fingerprint sensor also which is not very fast at all. Sometimes it failed to recognize your fingerprint.
The back panel is very weak which is made up of plastic. It will break if you often open it.
Don't go for it.